Uttar Pradesh and Bihar are the states that have been most affected by the reverse migration of workers from big cities to their hometowns and villages, suggests the choice of 116 districts under the Garib Kalyan Rojgar Abhiyaan (GKRA). As many as 63 of those districts are from these two states and account for a migrant population of over 4.1 million out of the total 6.7 million labourers across six states mapped for the programme, showed the first such data released by the Union government last week. Of the 38 districts in Bihar, 32 have been selected for the Abhiyaan, while of the 75 districts in Uttar Pradesh, 31 are among the 116 selected by the Centre. Together the two states comprise more than 50% of the most- affected districts in the country, the data showed.The 116 districts have all witnessed reverse migration, with each receiving more than 25,000 migrants.